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Yeah sounds good, er70 joins many things so I'm sure it'll be fine on the filler front, unless something is stainless or especially hard, which is unlikely.
I wouldn't preheat, that's more applicable for stuff that's thicker, where there is a risk of the bead cooling at a drastically different rate to the rest or the part
Biggles567
fizzy.bleach
i might be overthinking this, but i'm welding a mild steel home-made gear hanger to this pompino dropout. TIG.
i think the frame is 4130 (though no guaranteeing that the dropout is) and the hanger is bog standard mild steel cut from some angle. both ~6mm.
i had a quick google to see if there would be anything to worry about and i see people talking about preheat and using an ER-70S2 filler, which i have.
method wise, i was going to grind a slight bevel in to both pieces, tack x2 front and back and do a full run at the front and the back.
any bright ideas?